Ong Swee Keng LLC offers notary public and legalisation services to both corporate and private clients in Singapore and overseas.

Ong Swee Keng LLC was incorporated in 2015. Its predecessor firm, Ong Swee Keng & Co was formed several decades ago. Notable notaries associated with the firm were Mr Ong Swee Keng and Mr Wilson Yip. Ms Leslie Ho Suk Tsing now heads the firm.